Reclamation of purified metal.



W. O. HYZER.

REGLAMATION OF PUEIFIBD METAL. APPLICATION FILED APB..11, 1906.

Patep ted Dec. 14,1909,

FIGZ

FIG I INVE NTOR M; m/ a /yz'm, .470

S E S S E N W WILLIAM C. HYZER, OF PHILADELPHIA, PENNSYLVANIA To all whom it may concem:

Be it known that I, WILLIAM C. I-Irznn, of Philadelphia, in 'the county of Philadelphia and State of Pennsylvania, have .in-

' vented certain new and useful Improvements in the Reclamation of Purified Metal, whereof the following is a specification, reference belng had to the accompanying drawm s.

IVIy improvements relate to 'thereclamation of purified metal in a furnace of the class employed in re-melting typemetal preparatory to its being recast, but it is applicable. toother melting furnaces or processes in which metal is melted in order to remove from the molten metal, preparatory to its casting, the impur ties which tend to rise and form a scum on the surface and in which it is desirable to reclaim, so far as possible, all the plirificd metal. In such operations, and particularly in the melting .of

type metal, it has heretofore been customary to employ furnaces of the general character which I have disclosed, and after the metal has been rendered molten therein, to skim oif with a ladle the impnrities,'which rise to the surface as dross. The scum or dross thus removed always contains some metal mingled with it; but heretofore the difliculties involved 111 reclaiming the metal from the removed scum have been suchas to' render it uneconomical to attempt to reclaim it. Con- 7 tion which I have found convenient and useing furnace conveniently adapted for my invention. Fig. II, is a plan sectional view of a portion of said furnace, taken along the line II, II, in Fig. I. Fig; III, is a vertical transverse section of the same taken Specification of Letters Patent.

Application filed April 11, 1906. Serial No. 311,026.

RECLAMA'IION OF PURIFIED METAL.

Patented Dec. 14;, 1909.

along the Y e III, III, in Fig; ;.'Fig. IV, is a perspective view in detail of the supplemental dross melting pot. v

Referring to the drawings, 1, is a. stack which may be employed in connection with any convenient number of melting furnaces, of which two are shown in the drawings. I will describe the furnace which appears at the right of the stack, in Fig. II, the other furnaceto the left being similar in all respects. The melting furnace 2, is provided with a suitable grate 3, over which is suspended the melting pot 4, protected by a hinged lid 5. Extending from the furnace 2, above the grate 3, is a horizontal fine (3, through which the products of combustion are drawn from the grate beneath the melting pot 4, to the stack 1. Thus far I have described a construction of melting furnace common in the a rt.

In order to practice my invention, I insert within the fine (i, a supplemental dros: melting pot T, the shape of which more clearly appears in the drawing which constitutes Fi'g. IV, from which it will be observed that this pot is formed by combining a bottom wall 8, which gently inclines longitudinally from its opposite ends downwardly toward its center so as to form a trough shaped vessel, with two vertical side walls 9, 9. The pot T. is provided with one or more outlets 10, which lead through the vertical walls near their lowest point. Connected with each outlet 10. is a sloping discharge-pipe 11, as best shown in Figs. I I. andIII. Two such outlets with their discharge pipes are shown in the drawings. One is sufficient, and if two are present one or the other may be closed, so that they may be employed alternately.

As best shown in Fig. I, the pot 7, is supported lengthwise in the bottom of the horizontal fine 6, and for access to it an opening 12, is provided in the top of said flue, and protected by a hinged lid 13. The pipes 11, extend through the inclosing brickwork and deliver the molten contents of the pot 7, to any convenient receptacle placed beneath their lower ends.

In practicing my invention I proceer as follows: The type metal, or other metal "0 be reclaimed from its impurities, is place( in the main melting pot 4, and melted in the usual way. The scum rises to the surface other metals possessing a higher melting point. From time to time the scum is removed by a ladle, and as hereinbeforc explained this scum has heretofore been discarded as worthless dross. According to my invention the dross, after removal from the molten metal in the pot, is placed in the supplemental melting pot 7. Here it is again subjected to intense heat under different circumstances. The construction of this part of the furnace approximates the hearth of a reverberatory. furnace, that is to say, the heat is reflected upon the supplemental melting pot from above, and its contents are exposed to verylittle oxidation. Further- 'more the heating here is from the surface down and not from the bottom up, as in the main melting pot. As the result of this supplemental operation the metal remaining in the scum 1s again melted and, precipitating through the mass of impurities, passesout at the bottom through the outlet 10, and discharge pipe 11, at the bottom of the vertical wall of the supplemental melting pot, and is received in a suitablereceptacle and is thus recovered In passing out through the aperture 10, the metal does not carry with it any appreciable quantity of impurities, as these floating upon the surface, settle upon the gently sloping bottom,

and permit almost pure metal to trickle off through the openings in the vertical sides. From time to time the accumulated impurities are scraped out of the pot 7.

The construction of the supplemental 40 dross melting pot which I have described is a particularly'eflicacious one especially for the reclamation of type metal from its dross. The combination of the gently sloping bottom with the vertical sides and an opening near the lowest portion of the vertical sides much facilitates the running 0H of the remelted metal Without carrying with it any of the impurities from wlnch it is desirable to thus reclaim the metal.

Having thus described my invention, .1 claim:

1. A furnace for melting metal and reclaiming it from its impurities which comprises a grate and combustion chamber, a main melting pot provided with a lid and situated Within the combustion chamber; a supporting framework for the combustion chamber and melting pot, so closed that the removal of the lid of the melting pot afiords no escape for the products of combustion ;.a horizontal flue leading to a stack through which the products of combustion are led away from the combustion chamber; and a supplemental dross melting pot interposed within the bottom of said horizontal flue, said supplemental melting pot being-provided with a discharge pipe at the bottom, a id said flue being provided with an opening directly'over the supplemental melting pot, whereby the dross from the main melting pot may be'readily skimmed and transferred to the supplemental melting pot wherein the metal is re-melted and reclaimed.

2. A .dross melting furnace comprising a combustion chamber, a horizontal flue, and a dross melting pot inserted on the lower side of said horizontal flue and provided with vertical walls and also with gently sloping walls, and with an aperture ina vertical wall having its bottom-flush with the bottom of the. melting pot. 4

3. The process of reclaiming purifiedmetal from dross, which consists in placing dross in a suitable receptacle, and there subecting it to the reverberatory action of'heated products of combustion, led over the top of th dross, whereby the dross is heated from the top downward, and the melted metal permitted to escape through an aperture in the bottom of the receptacle.

In testimony whereof, I have hereunto signed my name, at Philadelphia, Pennsylvania, this 10th day of April 1906.

WILLIAM HYZER] \Vitnesses:

JAMES H. BELL, E. L. FULLERTON. 

